Method of making plywood cores

ABSTRACT

METHOD OF MAKING PLYWOOD VENEER CORES OR SHEETS BY CONTINUOUSLY BRINGING A SUCCESSION OF THIN RANDOM WITH WOOD VENEER SECTIONS OF SUBSTANTIALLY THE SAME LENGTH INTO EDGE-TO-EDGE CONTACT, EXTRUDING A PLURALITY OF CONTINUOUS BEADS OF A HOT MELT ADHESIVE ONTO THE UPPER SURFACE OF EACH OF THE ABUTTING SECTIONS AND SIMULTANEOUSLY PRESSING A STRONG, POROUS PAPER TAPE ONTO EACH OF THE ADHESIVE BEADS IN SUCH A MANNER THAT THE ADHESIVE IS CAUSED TO ADHERE TO THE UNDERSURFACE OF EACH TAPE, WHEREBY STRONG ADHESIVE BONDS ARE FORMED BETWEEN EACH OF THE TAPES AND THE UNDERLYING SURFACES OF EACH OF THE SECTIONS. ALTERNATIVELY, THE TAPES MAY BE PRECOATED WITH THE ADHESIVE AND CONTINUOUSLY APPLIED TO THE SECTIONS WITH THE ADHESIVE SIDE DOWN AND THE ADHESIVE MELTED AND REACTIVATED IN SITU BY PRESSING THE TAPE INTO CONTACT WITH THE SECTIONS BY MEANS OF A HEATED ROLL. IN EITHER CASE THE RESULTING PRODUCT IS A MULTI-SECTION THIN VENEER CORE SHEET WHICH UNEXPECTEDLY HAS SUFFICIENT STRENGTH AND OTHER DESIRABLE PROPERTIES TO ENABLE IT TO BE CUT INTO 4 X 8 FOOT SHEETS OR PLYS FOR USE IN STANDARD PLYWOOD LAMINATING OPERATIONS.

FENSWE PUBLlCATlUN UNITED STATES PATENT OFFICE Published at the requestof the applicant or owner in accordance with the Notice of Dec. 16,1969, 869 O.G. 687. The abstracts of Defensive Publication applicationsare identified by distinctly numbered series and are arrangedchronologically. The heading of each abstract indicates the number ofpages of specification, including claims and sheets of drawingscontained in the application as originally filed. The files of theseapplications are available to the public for inspection and reproductionmay be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED MARCH 7, 1972 T896,014 METHOD OF MAKING PLYWOOD CORES JamesEdward Hulfaker, 1117 Radclilfe 37664, and Brian Douglas Dillon, 2120Gary St. 37660, both of Kingsport, Tenn.

Filed Ian. 11, 1971, Ser. No. 105,397 Int. Cl. 1332b 5/12 US. Cl. 161-602 Sheets Drawing. 19 Pages Specification Method of making plywood veneercores or sheets by continuously bringing a succession of thin randomwith wood veneer sections of substantially the same length intoedge-to-edgc contact, extruding a plurality of continuous beads of a hotmelt adhesive onto the upper surface of each of the abutting sectionsand simultaneously pressing a strong, porous paper tape onto each of theadhesive beads in such a manner that the adhesive is caused to adhere tothe undersurface of each tape, whereby strong adhesive bonds are formedbetween each of the tapes and the underlying surfaces of each of thesections. Alternatively, the tapes may be precoated with the adhesiveand continuously applied to the sections with the adhcsive side down andthe adhesive melted and reactivated in situ by pressing the tape intocontact with the sections by means of a heated roll. In either case theresulting product is a multi-section thin veneer core sheet whichunexpectedly has sufiicient strength and other desirable properties toenable it to be cut into 4 x 8 foot sheets or plys for use in standardplywood laminating operations.

Mwch 7 HQE E HUFFAKR ife AL Tg fimlfl METHOD OF MAKING PLYWGOD CC'RES'Filed Jan, 11, 1971 ADHESIVE APPLFCQTOR SECHCN CHOWDER SECTION JAMES E.HUFFAKER BRIAN D. DILLON INVENTORS ATTORNEY March 7, 1972 Filed Jan. 11,1971 J. E. HUFFAKER ETAL METHOD OF MAKING PLYWOOD CORES 2 Sheets-Sheet 2JAMES E. HUFFAKER BRIAN D. DILLON INVENTORS BY ZZ $4 41 ATTORNEY

